Ultrasonic velocity (U), density (ρ) and viscosity (η) measurements have been carried out in three ternary
mixtures of glucose with amylase in aqueous medium at 298.15 K. The experimental data have been used to calculate some
derived parameters such as acoustical impedance (Z), relative association (RA), Rao's constant (R), Wada's constant (W), relaxation time (τ), relaxation amplitude (α/f2), relaxation strength (r), and some excess
thermodynamical properties like excess adiabatic compressibility (βE), excess free length (LfE) excess
free volume (VfE), excess internal pressure (πiE) and excess acoustical impedance (ZE). The above
parameters have been evaluated and discussed in light of molecular interactions in the mixture.